Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Improving the effectiveness of the AGC
Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping
Reducing the effect of noise at low modulation depths

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To help the image frequency rejection
To permit easier tracking
To allow adequate frequency coverage without switching
Because otherwise an intermediate frequency could not be produced

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Radio Receivers
In a radio receiver with simple AGC

The highest AGC voltage is produced
An increase in signal strength produces more AGC
The faster the AGC time constant the more accurate the output
The audio stage gain is normally controlled by the AGC

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